Pulverizer



May 5, 1942 w. J. MOERLIN Erm. 2,281,855

` PULvEHIzER Filed July 1, 1940 @MPM/72% Arto EYJ. l

Patented May 5, 1942 PULVERIZER william J. Moerlin, otto Bernat, and Jess P. Wales, Denver, Colo., assignors to The 'Mine and Smelter Supply Company, Denver, Colo., a

corporation of Colorado Application July 1, 1940, Serial No. 343,362

(Cl. SSFS) 3 Claims.

This invention relates to improvements in pulverizers of the type ordinarily used in grinding ore for assay purposes or the like.

Pulverizers of this type have ordinarily been constructed so that a stationary grinding member cooperates with a complementary moving member that is mounted for both rotation and gyration. Heretofore, the mechanism employed for producing the rotation and gyration of the movable grinding element has been somewhat complicated. Another difficulty inherent in some of the prior art structures, has been the leaking of grease from the moving parts into the grinding chamber, which is highly undesirable.

It is a principal objectof` the present invention to simplify the moving parts in a pulverizer and yet retain the desirable feature of a rotating and gyrating attrition member.

Another object is to provide in a pulverizer oi this charactenstructure whereby grease or oil is definitely sealed away from the grinding charnber, and whereby abrasive dust is effectively sealed out of the moving parts.

A further object is to so construct a pulverizer of this kind, that improved means are provided for selectively positioning the moving grinding element with reference to the cooperating stationary grinding element, the spacing between these grinding elements being of high importance, in that it determines the neness of the grind.

Other objects and advantages reside in details of design and construction which will be more fully disclosed in the following description and in the drawing wherein like parts have been similarly designated and in which the ligure illustrates a general side View, partially in elevation and partially in section, of a pulverizer built according to the present inventive concept.

In order to disclose an operative reduction to practice of the present invention, the accompanying drawing, which is made a part hereof, will be described in some particularity. However, this disclosure is, intended merely to be a typical example and it should not be construed to express or to imply any particular limitation to the invention, the scope of which is, in reality, measured by the appended claims.

In the drawing, reference character 5 denotes a stationary base structure providing therewithin a grinding chamber 6 into which is removably inserted a drawer 1. A feed chute 8 connects with the interior of the chamber 6 for introducafter grinding, falls into drawer l` where it is collected for removal.

The feed chute 8, inclusive of its adjacent wall structure which together complete the front and side closure of the grinding chamber 6, are

mounted on hinge pin 9 so that the chamber may be opened by loosening pivotal hand screw ID. A stop I2 is provided on the hinged structure and is in a position to contact spring bumper I3 which provides a cushioned limiting factor for the angular movement of ythe structure that moves about hinge pin 9.

Carried upon the base structure 5 is a housing I4 which is movable with reference to said base along ways I5. A motor I6 is mounted upon the housing I4 and has a pulley element-I1 which, in the present example, has two grooves of the same diameter that carry transmission belts IB a-nd a third groove of lesser diameter, carrying transmission belt I9.

The transmission belts IB drive a pulley element 2l) that is keyed to a short shaft 2I which is suitably journalled in a rotary sleeve 22 and which is driven by the transmission belt I9 through the intermediary of a relatively large pulley 23 mounted thereon.

The rotary sleeve 22 is journalled in the housing I4. A shaft 24 is eccentrically journalled for rotation within the rotary sleeve 22, in bearings 24a, 24b and 24a and carries a movable attrition plate or disc 25 that cooperates with a complementary, stationary grinding plate or disc 26. Center line A is the center of rotation of the sleeve 22. Center line B is the center of the shaft 24 which rotates and also gyrates.

A feature that is of particular importance is a sealing element that surrounds the shaft 24 to completely seal all lubricant away from grinding chamber 6, and at the same time prevent abrasive dust from entering the interior of the disc-driving mechanism. This sealing element comprises a sleeve 2'I, packing 21a and a collar 21h, which components are mounted upon the sleeve 22 for conjoint rotation therewith. The outer peripheryof the collar 2lb is in sealed sliding engagement with a relatively stationary packing ring 21e that is carried upon the housing I4.

It is entirely obvious that the sealing element 2`I being carried upon the rotary sleeve 22 will rotate slowly therewith, and that portion of said sealing element which immediately surrounds the shaft 24 is eccentric with reference to said sleeve 22 the same amount as the shaft 24 and ing the ore or other material to be ground, which, an thereby follows`l the gyratory movements of said shaft 24 providing a constant seal around the shaft.

In order to selectively position the grinding disc or plate 25 in the desired spaced relationship with reference to stationary grinding element 26, the entire driving assembly which is carried upon housing I4 and which is, therefore, conjointly movable with said housing may be selectively positioned by means of a hand wheel 28 and a screw 29 which is threaded into lug 3u which is carried upon the stationary base 5.

A resilient member 3l cooperates with notches 32 in hand wheel 28 to hold said wheel and therefore the entire movable structure, inclusive of housing I4, movable grinding disc 25, motor I6 and the entire transmission mechanism, in. the selected position, thus providing the proper spacing between the grinding elements 25 and 26.

A jaw clutch assembly 33 transmits driving power from short shaft 2I to disc-driving shaft 24, and it thus will be seen that shafts 2| and 24 rotate conjointly and at the same speed, while rotary sleeve 22 rotates at a relatively fewer number of revolutions per minute, thus to provide the desirable rotating and gyrating movement of the attrition disc 25. The jaw clutch element 33 is constructed to permit relative radial movement between that portion of the clutch that is keyed to the short shaft 2|, and that portion of the clutch that is keyed to the driven shaft 24.

According to this inventive concept, the desired movement of the movable attrition member 25 is attained in a very simple, rugged and dependable manner and with a minimum number of movable and wearing parts.

The seal around the shaft 24 adjacent the grinding chamber B is highly efficient and solves an old problem inherent in such devices.

The particular mounting of the entire driving and transmission mechanism on and in a separate housing I4 that is movable with reference to the stationary base 5 and therefore movable with reference to the stationary grinding element 26, is a new and unusually ecient way of providing for selective spacing between the two cooperating grinding attrition members 25 and 26.

As the housing I4 moves with reference to the stationary base 5, felt wipers 34 which are in contact with ways or guides I5, clear dust from said ways or guides, thus tending to prevent undue friction and wear.

What we claim and desire to secure by Letters Patent is:

1. In a pulverizer of the character disclosed inclusive of a base structure, a grinding chamber, a stationary grinding member within the chamber, and a rotary grinding member positioned to cooperate with said stationary grinding member, the improvement which comprises a housing slidably mounted upon the base structure, means for moving said housing toward and away from said grinding chamber, a sleeve journalled for rotation in said movable housing, a shaft eccentrically journalled for rotation within the sleeve and extending into said grinding chamber for supporting and rotating said rotary grinding member, another shaft concentrically journalled within said rotary sleeve in axially spaced relationship to the eccentric shaft, means for transmitting rotary movement from the concentric shaft to the eccentric shaft, means for rotating the sleeve, and means for driving the concentric shaft therein at a greater number of revolutions per unit of time than the sleeve is rotated.

2. In a pulverizer ofthe character disclosed inclusive of a base structure, a grinding chamber,` a stationary grinding member within the chamber, and a rotary grinding member positioned to cooperate with said stationary grinding member, the improvement which comprises a housing slidably mounted upon the base structure, means for moving said housing toward and away from said grinding chamber, a sleeve journalled for rotation in said movable housing, a shaft eccentrically journalled for rotation within the sleeve and extending into said grinding chamber for supporting and rotating said rotary grinding member, another shaft concentrically journalled within said rotary sleeve in axially spaced relationship to the eccentric shaft, means for transmitting rotary movement from the concentric shaft to the eccentric shaft, means for rotating the sleeve, means for driving the concentric shaft therein at a greater number of revolutions per unit of time than the sleeve is rotated, and sealing means carried upon the rotary sleeve for conjoint rotation therewith and having an eccentric portion surrounding the shaft between said sleeve and said grinding members whereby a sea-l is maintained around the shaft during said rotation of the shaft and the sleeve.

3. In a pulverizer of the character disclosed inclusive of a base structure, a grinding chamber, a stationary grinding member within the chamber, and a rotary grinding member positioned to cooperate with said stationary grinding member, the improvement which comprises a housing slidably mounted upon the base structure, means for moving said housing toward and away from said grinding chamber, a sleeve journalled for rotation in said movable housing, a shaft eccentrically journalled for rotation within the sleeve and extending into said grinding chamber for supporting and rotating said rotary grinding member, another shaft concentrically journalled within said rotary sleeve in axially spaced relationship to the eccentric shaft, means for transmitting rotary movement from the concentric shaft to the eccentric shaft, means inclusive of a prime mover carried upon said movable housing for rotating the sleeve, and means for driving the concentric shaft therein at a greater number of revolutions per unit of time than the sleeve is rotated.

WILLIAM J. MOERDIN. OTTO BERNDT. JESS P. WALES. 

